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Unformatted text preview: tokarski (at23678) – The law of motion – Morozova – (11104) 1 This print-out should have 12 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 (part 1 of 2) 10.0 points A book is at rest on an incline as shown below. A hand, in contact with the top of the book, produces a constant force F hand vertically downward. F hand B o o k The following figures show several attempts at drawing free-body diagrams for the book. Which figure has the correct directions for each force? The magnitudes of the forces are not necessarily drawn to scale. 1. weight friction normal force 2. normal force friction weight 3. weight normal friction force 4. weight force friction normal correct 5. weight friction force normal 6. weight force normal friction 7. normal friction weight force 8. weight force normal friction Explanation: The normal force points perpendicular to the surface of the inclined plane. The weight force points down. The F hand also points down. The friction force keeps the book from sliding and consequently points up the incline. 002 (part 2 of 2) 10.0 points For the normal force exerted on the book by the wedge in the diagram, which force(s) complete(s) the force pair for Newton’s third law (action-reaction)? tokarski (at23678) – The law of motion – Morozova – (11104) 2 1. the component of gravity pointing parallel to the surface of the incline 2. the pull of the earth on the book 3. the pull of the book on the earth 4. the component of gravity pointing per- pendicular to the surface of the incline 5. the component of F hand pointing perpen- dicular to the surface of the incline 6. the normal force exerted on the wedge by the book correct 7. the sum of the component of gravity per- pendicular to the surface of the incline and the component of F hand perpendicular to the surface of the incline Explanation: The force that completes the third law pair with the normal force of the wedge on the book is the normal force of the book on the wedge....
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This document was uploaded on 06/01/2009.
- Spring '08